python-osc/pythonosc/osc_message_builder.py at master · levaitamas/python-osc · GitHub

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"""Build OSC messages for client applications."""

from pythonosc import osc_message

from pythonosc.parsing import osc_types

from typing import List, Tuple, Union, Any, Optional

ArgValue = Union[str, bytes, bool, int, float, osc_types.MidiPacket, list]

class BuildError(Exception):

"""Error raised when an incomplete message is trying to be built."""

class OscMessageBuilder(object):

"""Builds arbitrary OscMessage instances."""

ARG_TYPE_FLOAT = "f"

ARG_TYPE_DOUBLE = "d"

ARG_TYPE_INT = "i"

ARG_TYPE_INT64 = "h"

ARG_TYPE_STRING = "s"

ARG_TYPE_BLOB = "b"

ARG_TYPE_RGBA = "r"

ARG_TYPE_MIDI = "m"

ARG_TYPE_TRUE = "T"

ARG_TYPE_FALSE = "F"

ARG_TYPE_NIL = "N"

ARG_TYPE_ARRAY_START = "["

ARG_TYPE_ARRAY_STOP = "]"

_SUPPORTED_ARG_TYPES = (

ARG_TYPE_FLOAT, ARG_TYPE_DOUBLE, ARG_TYPE_INT, ARG_TYPE_INT64, ARG_TYPE_BLOB, ARG_TYPE_STRING,

ARG_TYPE_RGBA, ARG_TYPE_MIDI, ARG_TYPE_TRUE, ARG_TYPE_FALSE, ARG_TYPE_NIL)

def __init__(self, address: Optional[str] = None) -> None:

"""Initialize a new builder for a message.

Args:

- address: The osc address to send this message to.

"""

self._address = address

self._args = [] # type: List[Tuple[str, Union[ArgValue, None]]]

@property

def address(self) -> Optional[str]:

"""Returns the OSC address this message will be sent to."""

return self._address

@address.setter

def address(self, value: str) -> None:

"""Sets the OSC address this message will be sent to."""

self._address = value

@property

def args(self) -> List[Tuple[str, Union[ArgValue, None]]]:

"""Returns the (type, value) arguments list of this message."""

return self._args

def _valid_type(self, arg_type: str) -> bool:

if arg_type in self._SUPPORTED_ARG_TYPES:

return True

elif isinstance(arg_type, list):

for sub_type in arg_type:

if not self._valid_type(sub_type):

return False

return True

return False

def add_arg(self, arg_value: ArgValue, arg_type: Optional[str] = None) -> None:

"""Add a typed argument to this message.

Args:

- arg_value: The corresponding value for the argument.

- arg_type: A value in ARG_TYPE_* defined in this class,

if none then the type will be guessed.

Raises:

- ValueError: if the type is not supported.

"""

if arg_type and not self._valid_type(arg_type):

raise ValueError(

'arg_type must be one of {}, or an array of valid types'

.format(self._SUPPORTED_ARG_TYPES))

if not arg_type:

arg_type = self._get_arg_type(arg_value)

if isinstance(arg_type, list):

self._args.append((self.ARG_TYPE_ARRAY_START, None))

for v, t in zip(arg_value, arg_type): # type: ignore[var-annotated, arg-type]

self.add_arg(v, t)

self._args.append((self.ARG_TYPE_ARRAY_STOP, None))

else:

self._args.append((arg_type, arg_value))

# The return type here is actually Union[str, List[<self>]], however there

# is no annotation for a recursive type like this.

def _get_arg_type(self, arg_value: ArgValue) -> Union[str, Any]:

"""Guess the type of a value.

Args:

- arg_value: The value to guess the type of.

Raises:

- ValueError: if the type is not supported.

"""

if isinstance(arg_value, str):

arg_type = self.ARG_TYPE_STRING # type: Union[str, Any]

elif isinstance(arg_value, bytes):

arg_type = self.ARG_TYPE_BLOB

elif arg_value is True:

arg_type = self.ARG_TYPE_TRUE

elif arg_value is False:

arg_type = self.ARG_TYPE_FALSE

elif isinstance(arg_value, int):

if arg_value.bit_length() > 32:

arg_type = self.ARG_TYPE_INT64

else:

arg_type = self.ARG_TYPE_INT

elif isinstance(arg_value, float):

arg_type = self.ARG_TYPE_FLOAT

elif isinstance(arg_value, tuple) and len(arg_value) == 4:

arg_type = self.ARG_TYPE_MIDI

elif isinstance(arg_value, list):

arg_type = [self._get_arg_type(v) for v in arg_value]

elif arg_value is None:

arg_type = self.ARG_TYPE_NIL

else:

raise ValueError('Infered arg_value type is not supported')

return arg_type

def build(self) -> osc_message.OscMessage:

"""Builds an OscMessage from the current state of this builder.

Raises:

- BuildError: if the message could not be build or if the address

was empty.

Returns:

- an osc_message.OscMessage instance.

"""

if not self._address:

raise BuildError('OSC addresses cannot be empty')

dgram = b''

try:

# Write the address.

dgram += osc_types.write_string(self._address)

if not self._args:

dgram += osc_types.write_string(',')

return osc_message.OscMessage(dgram)

# Write the parameters.

arg_types = "".join([arg[0] for arg in self._args])

dgram += osc_types.write_string(',' + arg_types)

for arg_type, value in self._args:

if arg_type == self.ARG_TYPE_STRING:

dgram += osc_types.write_string(value) # type: ignore[arg-type]

elif arg_type == self.ARG_TYPE_INT:

dgram += osc_types.write_int(value) # type: ignore[arg-type]

elif arg_type == self.ARG_TYPE_INT64:

dgram += osc_types.write_int64(value) # type: ignore[arg-type]

elif arg_type == self.ARG_TYPE_FLOAT:

dgram += osc_types.write_float(value) # type: ignore[arg-type]

elif arg_type == self.ARG_TYPE_DOUBLE:

dgram += osc_types.write_double(value) # type: ignore[arg-type]

elif arg_type == self.ARG_TYPE_BLOB:

dgram += osc_types.write_blob(value) # type: ignore[arg-type]

elif arg_type == self.ARG_TYPE_RGBA:

dgram += osc_types.write_rgba(value) # type: ignore[arg-type]

elif arg_type == self.ARG_TYPE_MIDI:

dgram += osc_types.write_midi(value) # type: ignore[arg-type]

elif arg_type in (self.ARG_TYPE_TRUE,

self.ARG_TYPE_FALSE,

self.ARG_TYPE_ARRAY_START,

self.ARG_TYPE_ARRAY_STOP,

self.ARG_TYPE_NIL):

continue

else:

raise BuildError('Incorrect parameter type found {}'.format(

arg_type))

return osc_message.OscMessage(dgram)

except osc_types.BuildError as be:

raise BuildError('Could not build the message: {}'.format(be))

python-osc/pythonosc/osc_message_builder.py at master · levaitamas/python-osc · GitHub

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